A police officer stands outside the entrance to Sandy Hook Elementary School in Newtown, Conn., on Dec. 15, 2012. Spencer Platt/Getty Images hide caption

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Former Rep. Gabby Giffords and her husband, Mark Kelly, at a gun show in Saratoga Springs, N.Y., in October. Giffords was shot in the head in a 2011 mass shooting in Tucson. She and Kelly have since founded a political action committee to push for tougher gun laws. Tim Roske/AP hide caption

itoggle caption Tim Roske/AP

Dec. 18, 2012: Crime scene tape stretches across the property outside the home where Adam Lanza lived with his mother, Nancy Lanza. Inside, police found weapons and other evidence. Lucas Jackson /Reuters /Landov hide caption

itoggle caption Lucas Jackson /Reuters /Landov

Wooden angels memorialize the victims of Adam Lanza's shooting spree in Newtown, Conn., last December. An upcoming Frontline documentary seeks to provide new details about Lanza and his mother, Nancy. Emmanuel Dunand/AFP/Getty Images hide caption

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Neil Heslin brought a framed photo of himself and his son Jesse (when the boy was an infant) to Monday's hearing in Hartford, Conn. The 6-year-old was killed at Sandy Hook Elementary School in December's shooting. Cloe Poisson/Hartford Courant /MCT /Landov hide caption

itoggle caption Cloe Poisson/Hartford Courant /MCT /Landov

This photograph of Aline Marie praying outside St. Rose of Lima church in Newtown, Conn., has become the focus of a conversation surrounding ethics and photography on NPR's Picture Show blog. Emmanuel Dunand/AFP/Getty Images hide caption

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President Obama, accompanied by Vice President Joe Biden, talks at the White House on Jan. 16 about proposals to reduce gun violence. Obama has called for a ban on military-style assault weapons and high-capacity ammunition magazines and is pushing other policies in the wake of the mass shooting last month at an elementary school in Newtown, Conn. Charles Dharapak/AP hide caption

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Early Thursday morning, a school bus carrying students from Sandy Hook Elementary headed to their new school. Timothy A. Clary/AFP/Getty Images hide caption

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The Journal News' map of gun owners in Rockland County, N.Y. At its website, the image is interactive so that users can see who has handgun permits and where they live. The Journal News hide caption

itoggle caption The Journal News

Remembering the victims: Earlier this month, two mourners paused at a makeshift memorial in Newtown, Conn., for the children and adults killed at Sandy Hook Elementary School. Zhang Chuanshi /Xinhua /Landov hide caption

itoggle caption Zhang Chuanshi /Xinhua /Landov

After the attack: Balloons hung from the Sandy Hook Elementary School sign on Dec. 15. On Dec. 14, six adults and 20 children were killed there before the gunman took his own life. Shannon Stapleton/Reuters /Landov hide caption

itoggle caption Shannon Stapleton/Reuters /Landov